dprintf, vdprintf - print to a file descriptor
int dprintf(int fd, const char *format, ...);
int vdprintf(int fd, const char *format, va_list ap);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
Since glibc 2.10: _XOPEN_SOURCE >= 700 || _POSIX_C_SOURCE >= 200809L Before glibc 2.10: _GNU_SOURCE
The functions dprintf() and vdprintf() (as found in the glibc2 library) are exact analogs of fprintf(3) and vfprintf(3), except that they output to a file descriptor fd instead of to a stdio stream.
These functions are GNU extensions that are nowadays specified in POSIX.1-2008.
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